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Michigan commercial property insurance punishes one mistake harder than any other: carrying a building limit that has not kept up with what the building actually costs to rebuild. It does not punish you at renewal, when you would notice. It punishes you at the adjuster's desk, on a partial loss, through a coinsurance clause most owners have never read. If you own commercial buildings, or you are a real estate investor holding a small portfolio, these are the five provisions that decide what you actually collect.
The short version: Coinsurance reduces every partial claim in proportion to how underinsured you are. Commercial property defaults to actual cash value, not replacement cost, unless you elect otherwise. Building code upgrades are excluded unless you buy ordinance or law coverage. A building sitting empty for sixty days loses coverage for vandalism, theft and water damage entirely, and everything else pays 15 percent less. And your tenant's certificate of insurance does nothing at all for your building.
Coinsurance: the penalty you never see coming
The coinsurance clause lives in the Additional Conditions of the ISO Building and Personal Property Coverage Form (CP 00 10). In plain terms, it requires you to carry insurance equal to a stated percentage — commonly 80, 90 or 100 percent — of the property's value at the time of loss. Carry less, and the insurer pays only the proportion you did carry.
The formula: (amount of insurance carried ÷ amount of insurance required) × the loss, minus your deductible.
Here is what that means with real numbers:
| Item | Amount |
|---|---|
| Building value at time of loss | $1,000,000 |
| Coinsurance requirement (80%) | $800,000 required |
| Limit you actually carried | $600,000 |
| Fire loss | $100,000 |
| Deductible | $1,000 |
| Insurer pays | ($600,000 ÷ $800,000) × $100,000 = $75,000, less $1,000 = $74,000 |
| You absorb | $26,000 — the $25,000 coinsurance penalty plus your $1,000 deductible |
Note what happened. The owner was underinsured, but nowhere near catastrophically — three quarters of the required amount. The loss was small relative to the building. And the owner still ate $26,000 on a $100,000 fire. That is the mechanism, and it applies to every partial loss, which is what almost every commercial property claim is.
Two things follow. First, a building limit is not a budget decision; it is a rebuild-cost estimate that needs updating as construction costs move. Second, the fastest way to be underinsured is to leave a limit alone for five years while material and labor costs climb.
Agreed value: turning the penalty off
You can suspend the coinsurance condition by electing the Agreed Value option. This is a Declarations-page election, not a separate endorsement — if you see an article citing an ISO form number for agreed value, it is out of date. In exchange, you sign a statement of values reflecting the full value of the property, and the insurer agrees not to apply coinsurance for a stated period, usually the policy term.
The catch is the expiration. Agreed value lapses on its stated date, and if the statement of values is not refreshed, coinsurance reinstates without anyone telling you. Treat the annual statement of values as a real task, not paperwork.
Replacement cost is an election, not a default
Commercial property forms default to actual cash value — replacement cost minus depreciation. Replacement cost is an option you elect on the Declarations. On a thirty-year-old roof, that difference is enormous.
Even with replacement cost elected, the amount above actual cash value is generally not paid until you actually repair or replace, and the form requires you to do so as soon as reasonably possible. Insurers typically pay actual cash value first and release the depreciation holdback on proof of completed work. If your plan after a loss is to take the check and sell the property as-is, understand that replacement cost coverage will not fund that.
Ordinance or law: the code upgrade nobody budgets for
The standard causes of loss form contains an Ordinance or Law exclusion: the enforcement of or compliance with any ordinance or law regulating construction, use or repair of property, or requiring the tearing down of property including debris removal. Read that plainly. If a fire destroys 40 percent of a 1970s building and the municipality requires the rest to come down, or requires the rebuild to meet current electrical, sprinkler, energy and accessibility codes, the base policy does not pay for any of it.
Ordinance or Law coverage (CP 04 05) fixes this in three parts:
- Coverage A — Loss to the undamaged portion of the building. Pays for the value of the part that was fine but has to come down anyway.
- Coverage B — Demolition cost. Pays to tear it down and haul it away.
- Coverage C — Increased cost of construction. Pays the added cost of rebuilding to current code.
The older your building and the stricter your municipality, the more this matters. One structural point owners miss: Coverage A is paid inside your building limit, not on top of it, so it only helps if that limit was already adequate — which loops straight back to the coinsurance problem above. Coverages B and C carry their own scheduled limits, sometimes shown combined, and a token amount on Coverage C does not solve a full code-upgrade rebuild.
The 60-day vacancy clause
This one catches investors between tenants, and it is unforgiving. Under the vacancy condition, a building owned by you is considered vacant unless at least 31 percent of its total square footage is rented to a lessee or sublessee and used for customary operations, or used by you for customary operations. Once a building has been vacant for more than 60 consecutive days (day 60 itself is not yet vacant):
- There is no coverage at all for loss caused by vandalism, sprinkler leakage (unless the system was protected against freezing), building glass breakage, water damage, theft, or attempted theft.
- Payment for damage from any other covered cause of loss is reduced by 15 percent.
One important exception: buildings under construction or renovation are not considered vacant under the form. If you are actively rehabbing a space between tenants, the vacancy provisions should not bite. "Actively" is the operative word — a permit pulled two years ago on a building nobody has touched since is not renovation, and if the work is intermittent or finished, treat the clock as running.
Look at that list again. Vandalism, theft and water damage are precisely what happens to empty buildings in a Michigan winter. The exclusion is aimed exactly at the losses vacancy causes. If you have a building emptying out, tell your agent before the sixty days runs, not after the pipes freeze. A vacancy permit endorsement is usually available, and it is cheap compared to the alternative.
Loss of rents is a separate purchase
When a covered loss makes your building untenantable, your mortgage does not pause. Rental Value coverage — written under the Business Income forms, CP 00 30 (with extra expense) or CP 00 32 (without) — replaces the rental income you would have collected, plus continuing normal operating expenses and any costs that were legally the tenant's obligation but fall back to you.
The Declarations offer three mutually exclusive elections: business income including rental value, business income other than rental value, or rental value only. For a pure landlord, rental value only is usually the right box, and the limit needs to reflect a realistic rebuild timeline, not an optimistic one. On a total loss of a commercial building in this market, twelve months is often not enough. Our guide to Michigan business interruption insurance covers how these periods are calculated.
Your tenant's certificate does not protect your building
Every good lease requires the tenant to carry liability insurance and name you as an additional insured, typically using CG 20 11, Additional Insured — Managers or Lessors of Premises. That endorsement is worth having. It is also worth understanding precisely.
CG 20 11 is liability only. It protects you against claims brought by third parties arising out of the ownership, maintenance or use of the leased premises. It does not repair your building. It does not replace your roof. It does not pay your lost rents. A tenant's certificate of insurance, no matter how impressive the limits, does nothing for your first-party property. Your building is protected by your commercial property policy and nothing else.
It also has boundaries: it excludes structural alterations, new construction and demolition performed by you as the additional insured, and coverage generally ends when the tenant stops occupying the premises. If you manage buildings for others, our property management insurance page covers the additional exposures that come with that role. If your holdings are residential rather than commercial, start with our post on Michigan landlord and rental property insurance instead.
One Michigan-specific point about your policy forms
Michigan law allows most commercial lines rates, rules and forms to be exempt from filing with the Department of Insurance and Financial Services, provided the insurer includes the prescribed disclaimer on the policy (MCL 500.2236(8)(e), with rules and rates following under MCL 500.2401(2)(d) and MCL 500.2601(3)(f), enacted by PA 664 of 2002). Workers' compensation is excluded from that exemption and remains fully filed.
Why this matters to you as a building owner: it means commercial property forms in Michigan are not standardized the way personal lines are. Two carriers quoting your building can be quoting materially different contracts. Comparing them on premium alone is comparing nothing. Comparing coinsurance percentage, valuation basis, ordinance limits, vacancy handling and rental value period is comparing something.
Frequently Asked Questions
What is a coinsurance penalty on commercial property insurance?
If you carry less insurance than the coinsurance percentage requires, the insurer pays only the proportion of the loss equal to the insurance you carried divided by the insurance you should have carried, then subtracts your deductible. Carrying $600,000 where $800,000 was required means a $100,000 loss pays $75,000 before the deductible. It applies to partial losses, which is nearly all commercial property claims.
Is commercial property insurance replacement cost or actual cash value?
Actual cash value is the default on the standard form. Replacement cost is an option you elect on the Declarations page, and the replacement cost portion above actual cash value is generally not paid until the property is actually repaired or replaced. Always confirm which basis appears on your declarations rather than assuming.
How long can a commercial building be vacant before coverage changes?
More than sixty consecutive days. A building you own is considered vacant unless at least 31 percent of its square footage is being used for customary operations by you or a tenant. Past that point there is no coverage for vandalism, sprinkler leakage, glass breakage, water damage or theft, and all other covered losses are paid 15 percent less. Buildings genuinely under construction or renovation are not treated as vacant. Ask your agent about a vacancy permit before you cross the line.
Does my tenant's insurance cover my building?
No. A tenant naming you as an additional insured on their liability policy protects you against third-party liability claims arising from the premises. It does not cover physical damage to your building, and it does not cover your lost rental income. Only your own commercial property policy does that.
Do I need ordinance or law coverage on an older building?
If your building predates current codes, almost certainly. The base policy excludes the cost of complying with building ordinances entirely. Ordinance or Law coverage pays for the undamaged portion that must be demolished, the demolition itself, and the increased cost of rebuilding to code. Each of the three parts carries its own limit and each needs to be set realistically.
The bottom line
A commercial building program is judged on five numbers most owners have never checked: the coinsurance percentage, the valuation basis, the ordinance or law limits, the rental value period, and whether the building limit still reflects what construction costs today. Get those right and the premium takes care of itself. Get them wrong and you find out during the only claim that mattered.
We work best with established Michigan property owners — buildings you have held for a while, real leases, and a loss history we can look at. If that is you, send us your current declarations pages, your statement of values and your rent roll, and we will show you where the coinsurance math would land before we talk about price. As an independent agency representing more than twenty commercial carriers, we can shop a building schedule across markets rather than defending one company's form. Call (248) 693-6455 or request a building review.